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United States Patent | 5,643,417 |
Hanaya | July 1, 1997 |
In a method for forming a sheet from a fiber-water suspension, the fiber-water suspension is supplied on a traveling bottom wire at a first zone thereof to dewater the fiber-water suspension. Subsequently, the suspension is introduced between the bottom wire at a second zone and a top wire, and dewatering is effected. The sheet is further caused to travel around a sheet-forming roll while keeping the sheet in contact therewith by the bottom wire at a third zone thereof, and reformation of the sheet is carried out. Finally, the sheet on the bottom wire is caused to travel up to a fourth zone thereof to effect a further dewatering with a fourth dewatering device disposed adjacent to the bottom wire at the fourth zone thereof, whereby a final stage of sheet formation is carried out. An apparatus for carrying out the above method is also disclosed.
Inventors: | Hanaya; Morimasa (Mishima, JP) |
Assignee: | Tokushu Paper Mfg. Co., Ltd. (Shizuoka-ken, JP) |
Appl. No.: | 382803 |
Filed: | February 2, 1995 |
Feb 02, 1994[JP] | 6-030963 |
Current U.S. Class: | 162/300; 162/303; 162/304; 162/348; 162/350; 162/354 |
Intern'l Class: | D21F 001/24 |
Field of Search: | 162/301,300,304,348,350,354,272,273,274,289,298,303 |
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4523978 | Jun., 1985 | Pullinen | 162/301. |
4532008 | Jul., 1985 | Creagan et al. | |
4544447 | Oct., 1985 | Pinter et al. | 162/301. |
4623429 | Nov., 1986 | Tissari | 162/354. |
4686004 | Aug., 1987 | Fujiwara | 162/301. |
5248392 | Sep., 1993 | Bando et al. | 162/301. |
5437769 | Aug., 1995 | Bando et al. | 162/301. |
Foreign Patent Documents | |||
0 153 288 | Aug., 1985 | EP. | |
0 552 139 | Jul., 1993 | EP. | |
31 00 713 | Jul., 1982 | DE. | |
2 106 945 | Apr., 1983 | GB. |